A Pakistani health worker marks an infant after immunization with anti-polio drops in Lahore, Pakistan on March 12. Pakistani officials vow to eradicate polio by the end of 2012. Polio remains endemic in four countries – Afghanistan, India, Nigeria and Pakistan.

Residents living in the suburbs of Lahore, Pakistan carry their children to have polio drops administered to them on Monday, March 12. Pakistani officials vow to eradicate polio by the end of 2012. Polio remains endemic in four countries – Afghanistan, India, Nigeria and Pakistan

A woman holds her child as she waits for a polio vaccination in Peshawar, Pakistan, on March 12. Reports state that polio cases over last month has taken the country's total number of poliomyelitis-affected children to five in 2012, officials said. Most of the 198 cases recorded in 2011 were notified in the north western part of the country where local religious clerics and pro-Taliban lobby are reportedly trying to convince residents that the US-manufactured polio drops were designed to sterilize Pakistanis and reduce the Muslim population.